A horizontal wooden beam sags a bit when supported at its ends. In between the top and bottom surfaces is a region of

neither tension nor compression

Explanation:

The tension in the form of load or forces

And also compression in the form of weight or load since the sagging is negligible as interpreted from the question which say that - horizontal wooden beam sags a bit when supported at its ends. 

regalo means kya hota h

But also thanks for points